Node for local mesh curvature
This feature was added recently and should be in 2.74.


  This attribute means how "pointy" the geometry surface is, which
  allows to do effects like dirt maps and wear-off effects on render
  geometry. This means the attribute is calculated for the final mesh
  which means no baking (which implies UV unwrap) is needed. Apart from
  this the behavior is quite close to how vertex dirty colors works.
  
  The new attribute is available as an output socket of Geometry node.
  
  There's no penalty for the render time, only some delay on scene
  preparation (the delay is linear of the mesh complexity).